There's been a lot of talk since the election about how New Jersey Gov. Chris Christie's praise for President Obama's support during Hurricane Sandy may have cost Mitt Romney the election. It's very unlikely that enough opinions of Obama were changed to sway the outcome of the election.
If you're looking for someone or something to blame for Romney's loss, that blame belongs squarely on the shoulders of the media. The media have given Obama a free pass his entire first term in office. They have consistently turned their heads the other way and avoided reporting all of the scandals, corruption, illegal and unconstitutional executive orders that have come from the Obama administration.